After studying category theory and functional programming, I decided to put these concepts into practice by developing a simple web application. This project was inspired by the example in Chapter 11 of 'Programming in Haskell' by Graham Hutton. My goal was to take these theoretical programming ideas and see how they work in creating a real-world web application. The key concepts of functional programming are: Prioritize creating pure functions as much as possible. These are functions without side effects, making them simpler to test Use composition of pure functions to construct more intricate functions Use Functors, Applicatives, and Monads in scenarios that require pure functions, such as error handling or managing missing values, and when working with collections like trees and lists. I wrote this application in Java, utilizing the Spring Boot framework. This decision was influenced by my previous work in developing enterprise applications with this technology stack. My obj...